A. have B. had

C. have had D. had had

【答案】B

【解析】试题分析：考察虚拟语气。文意是对不起，我现在太忙了。如果有时间我肯定和你一块去看电影。本句中if引导的从句表示对现在的情况进行假设，从句用did，主句用“would＋do”，所以答案是B。